Free flap compromise in 8.2%, driven partly by fluid overload, low albumin and long operations

Design

Systematic review and random-effects meta-analysis of observational studies

Population

30,002 head and neck free flaps in 47 studies

Primary outcome

Flap compromise and total flap failure

Effect

Compromise 8.2% (6.6-9.9%), failure 3.9%; radiotherapy OR 3.98, fluid overload OR 2.57

A meta-analysis of 47 observational studies covering 30,002 head and neck free flaps estimated compromise and failure rates and pooled risk factors.

Flap compromise occurred in 8.2% (95% CI 6.6-9.9%) and complete failure in 3.9%. Prior radiotherapy had the strongest association (OR 3.98), with diabetes (OR 2.20), comorbidity (OR 1.68) and age (OR 1.35). Modifiable factors included fluid overload (OR 2.57), prolonged operative time (OR 2.14), low albumin (OR 2.06), low BMI (OR 1.75) and low haemoglobin (OR 1.34).

Radiotherapy and diabetes cannot be changed, but nutrition, anaemia and intraoperative fluid can. That shifts part of flap success into preoperative optimisation and anaesthetic practice.

These are associations; optimising albumin or fluids has not been shown in trials to reduce compromise.

• Screen nutrition and albumin at the first surgical visit and involve dietitians early.
• Correct anaemia before elective reconstruction where time allows.
• Agree goal-directed fluid management with anaesthesia to avoid overload.
• Increase flap monitoring intensity in irradiated and diabetic patients.

Why it matters

Part of the risk of flap failure lies in factors the team can change before and during surgery.

Don't overread it

The risk factors are observational associations; correcting them has not been proven to prevent flap compromise.

The statistics, in plain English

A pooled rate from 47 studies is reasonably precise, but odds ratios for risk factors can be inflated by confounding: low albumin, for example, may mark more advanced disease rather than cause flap problems.

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